Steam-shovel.



E. J. ARMSTRONG. STEAM SHOVEL.

APPUCAIION FILED mmzo, m5.

Patented Oct. 8, 1916.

EDW IN J. ARMSTRONG, F ERIE, PEN N SYLVAN EA,

ASSIGNGR 'I'G BALL ENGINE COM- PANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

STEAM-SHOVEL.

asa na Application filed January 20, 1915. Serial N 0. 3,363.

To all whom it may concern:

Be it known that I, EDWIN J. ARMSTRONG, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in Steam-Shovels, of which the following is a specification.

This invention relates to steam shovels and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims.

In the use of steam shovels it is necessary to limit the outward movement of the dipper stick so as to prevent its disengagement from the boom. This can be done by a stop which directly engages the boom but it will be readily understood that where this is used, the parts are subjected to great shock providing the dipper stick is moved to the limit at any speed.

The object of the present invention is to limit the stop, this movement of the dipper stick utilizing the crowding engine for this purpose so that the stopping of the movement of the dipper stick is accomplished without jar or shock to the parts.

The invention is illustrated in the accompanying drawings wherein 1 marksv the shovel frame or platform, 2 the wheels, 3 the turn table, l the boom, 5 the dipper stick, 6 the rack on the dipper stick, 7 the gear operating on the rack 6 to move the dipper stick relatively to the boom, 8 the shaft on which the gear '7 is mounted, 9 a gear mounted on the shaft 7, 10 a pinion meshing the gear 9, 11 the crank shaft of the engine on which the pinion 10 is mounted, 12 the crowding engine, 13 the rock shaft usually used as the actuating part of the controlling mechanism for controlling the crowding engine, 1a the rock arm on the rock shaft 13, and 15 a link extending from the rock shaft 13 to the hand lever 16 shown in dotted lines, by means of which the crowding engine is manually controlled.

The parts so far described are or may be of common construction, in fact, most of them are so universally used that they might be termed standard. By throwing the hand lever, the crowding engine may be reversed so as to move the dipper stick in and out as is desired. The hoisting cable 21 connected with the dipper 22 tends to move the dipper stick to some extent but the Specification of Letters Patent.

Patented Oct. 3, 1916.

real control of the dipper stick in and out is accomplished through the crowding engine.

I have provided the following mechanism to prevent jar or shock to the dipper stick when it is permitted to over-run. A rock arm 17 is arranged on the controlling shaft 13. A link 17 connects the rock arm 17 with a rock arm 18. The rock arm 18 is arranged on the rock shaft 18 A contact arm 19 is fixed on the rock shaft 18 in the path of a stop lug 20 on the end of the dipper.

The operation of the device is as follows: When the dipper stick 5 is permitted to over-run by a failure of the operator to manually stop or reverse the crowding engine, the stop lug 20 engages the contact lever 19. This rocks the shaft 18 and the rock lever 18 and also the rock lever 17 through the link 17, This operating through the controlling shaft 13 brings the engine to a standstill and with a further movement of the dipper stick reverses the engine, the movement of the controlling mechanism accomplishing this in the wellknown manner common to these engines. It will, therefore, be seen that with this structure there is no jar or shock, the steam of the crowding engine forming in effect a cushion which gradually brings the dipper stick to a stop. 7

What I claim as new is 1. In a steam shovel, the combination of a boom; a dipper stick slidingly mounted on the boom; a crowding engine for operating the dipper stick; a controlling mechanism for the engine; and devices on the stick acting on the controlling mechanism at the limit of the movement of the'stick to apply the power of the engine to arrest the movement of the stick.

9.. In a steam shovel, the combination of a boom; a dipper stic: slidingly mounted on the boom; a crowding engine for operating the dipper stick; a controlling mechanismfor the engine; a hand lever connected with the controlling mechanism manually controlling the engine; and devices on the stick acting on the controlling mechanism at the limit of the movement of the stick to apply the power of the engine to arrest the movement of the stick.

3. In a steam shovel, the combination of a boom; a dipper stick slidingly mounted adapted to actuate the same to stop and reverse the engine; and devices on the stick adapted to engage the contact lever at the limit of the movement of the stick to actnate the contact lever and thus actuate the controlling mechanism of the engine to apply the power of the engine to arrest the movement of the stick.

4C. In a steam shovel, the combination of a boom; a dipper stick slidingly mounted on the boom; a crowding engine for operating the dipper stick; controlling mechanism for the engine; a hand lever connect- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, 7

ed with the controlling mechanism and adapted to manually control the controlling mechanism; a contact lever connected W1th the controlling mechanism; and a stop lug on the dipper stick adapted to engage the contact lever for actuating the contact lever and the controlling mechanism to apply the power of the engine to stop the movement of the dipper stick.

In testimony whereof I have hereunto set my hand in the presence of two subscribing Witnesses.

EDWIN J. ARMSTRONG.

B. M. VHARTMAN.

Washington, I). G. 

